A = list(map(int, input().split())) + ['A']
B = list(map(int, input().split())) + ['B']
C = list(map(int, input().split())) + ['C']

L = [A, B, C]

L = sorted(L, key = lambda x : (-x[0], x[1]))

for i in range(3):
    print(L[i][2])